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-   -   Setting IS focal length question (https://forums.steves-digicams.com/olympus-micro-four-thirds-103/setting-focal-length-question-189073/)

Wes James Jun 16, 2011 2:20 PM

Setting IS focal length question
 
When setting the focal length/under the IS menu item, would I set it for the f/l of the lens- or the effective f/l- in other words-
With the kit lens, I'd set it for 40 (there's no 42)... or 80mm 35mm effective?
with a 100-300mm zoom, I'd set it for 300- or 600 effective?
with a 50mm lens from a 35mm camera I'd set it for 50??? or 100 effective?

shoturtle Jun 16, 2011 8:19 PM

it is the actually length not the crop you want to enter.

zig-123 Jun 16, 2011 8:48 PM

Quote:

Originally Posted by Wes James (Post 1234532)
When setting the focal length/under the IS menu item, would I set it for the f/l of the lens- or the effective f/l- in other words-
With the kit lens, I'd set it for 40 (there's no 42)... or 80mm 35mm effective?
with a 100-300mm zoom, I'd set it for 300- or 600 effective?
with a 50mm lens from a 35mm camera I'd set it for 50??? or 100 effective?

Hi Wes,


The only time you need to enter the focal length to attain IS is when mounting a legacy lens (manual focus) onto the camera body. Since the lens cannot communicate to the body, you have to input that info, i.e. 50 for a 50mm lens.
Forget the crop factor.

When using any of the Olympus m43 lenses, the camera recognizes the lens and automatically adjusts. So, no user input in required.

Zig

Wes James Jun 17, 2011 6:37 AM

Thanks for the info, Guys... I should have thought about the camera recognizing the lens! That's good- will cut down on the number of trips into the menu's.
Wes

Greg Chappell Jun 17, 2011 9:21 AM

Yes, when using micro-specific lenses that menu screen is usually grey-out anyway, meaning the camera is doing the work because it can "talk" with the lens.

Tullio Jun 17, 2011 9:23 AM

That's clear in case of primes. However, what if it's a zoom lens (i.e. 70-300mm)? Which FL should be entered?

Greg Chappell Jun 17, 2011 10:14 AM

Quote:

Originally Posted by Tullio (Post 1234755)
That's clear in case of primes. However, what if it's a zoom lens (i.e. 70-300mm)? Which FL should be entered?

If it's a micro 4/3rd's or DSLR 4/3rd's lens, the camera takes care of it.

Tullio Jun 17, 2011 11:36 AM

I'm talking MF lenses, not 4/3 or m4/3.

Greg Chappell Jun 17, 2011 1:00 PM

You would just have to guesstimate it and dial in something as close as you can. A royal PITA is what it would be. I'd be very tempted to just use a lens like that with IS turned off.

Wes James Jun 17, 2011 1:07 PM

Tullio-
I'm with you, as I have a very clean old late '70's Wolfpro 85-210 zoom lens that I'd like to use. That is part of where my question was directed originally. And obviously, with a lens like that the IS would certainly be very desireable!
Wes


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